libArchive modify data in .zip file -


i try modify( in memory ) 1 file in zip archive. not understand how it

i read source file memory not understand next

can give mу example how can this

why, here's simple c++11 example, replacing file , adding new file:

// g++ -std=c++11 -wall -g -o3 -fno-inline-functions pack.cc -o pack -larchive #include <iostream> using std::cout; using std::cerr; using std::endl; #include <memory> using std::shared_ptr; using std::unique_ptr; #include <string.h> #include <archive.h>  // cygwin's libarchive. http://www.libarchive.org/ #include <archive_entry.h>  int main (int argc, char** argv) {   const char* usage = "usage: pack $in.zip $out.zip $pathtoreplace";   const char* infile = argc > 1 ? argv[1] : nullptr; if (!infile) {cerr << usage << endl; return 1;}   const char* outfile = argc > 2 ? argv[2] : nullptr; if (!outfile) {cerr << usage << endl; return 1;}   const char* pathtoreplace = argc > 3 ? argv[3] : nullptr; if (!pathtoreplace) {cerr << usage << endl; return 1;}    shared_ptr<archive> in (archive_read_new(), [infile](archive* ar) {if (archive_read_finish (ar) != archive_ok) cerr << "error closing " << infile << endl;});   archive_read_support_format_zip (in.get());  // https://github.com/libarchive/libarchive/wiki/formatzip   int rc = archive_read_open_filename (in.get(), infile, 65536);   if (rc != archive_ok) {cerr << "error opening archive " << infile << endl; return 1;}    shared_ptr<archive> out (archive_write_new(), [outfile](archive* ar) {if (archive_write_finish (ar) != archive_ok) cerr << "error closing " << outfile << endl;});   archive_write_set_format_zip (out.get());   rc = archive_write_open_filename (out.get(), outfile);   if (rc != archive_ok) {cerr << "error opening archive " << outfile << endl; return 1;}    archive_entry* entry; while (archive_read_next_header (in.get(), &entry) == archive_ok) {     const char* path = archive_entry_pathname (entry);     int64_t size = archive_entry_size (entry);     char buf[size]; if (archive_read_data (in.get(), buf, size) != size) {cerr << "error reading " << path << endl; return 1;}     if (strcmp (path, pathtoreplace) == 0 && size > 3) {strcpy (buf, "bar"); size = 3;}  // replacing contents of given file.     rc = archive_write_header (out.get(), entry); if (rc != archive_ok) {cerr << "error writing " << path << endl; return 1;}     if (archive_write_data (out.get(), buf, size) != size) {cerr << "error writing " << path << endl; return 1;}   }    // add new file.   unique_ptr<archive_entry, void(*)(archive_entry*)> (archive_entry_new(), archive_entry_free);   archive_entry_set_pathname (we.get(), "foo");   archive_entry_set_size (we.get(), 3);   archive_entry_set_filetype (we.get(), ae_ifreg);   archive_entry_set_perm (we.get(), 0664);   rc = archive_write_header (out.get(), we.get()); if (rc != archive_ok) {cerr << "error writing foo" << endl; return 1;}   if (archive_write_data (out.get(), "bar", 3) != 3) {cerr << "error writing foo" << endl; return 1;}   return 0; }

Comments

Post a Comment

Popular posts from this blog

php - get table cell data from and place a copy in another table -

two-part question: have 2 tables: 1 table items , other table selected items copied when add button clicked. after, when items wanted selected, there 'finished' button post items selected db. i started javascript didn't far @ because jquery seems better suited i'm not familiar it function addto() { var div = document.getelementbyid('fixeddiv','inside'); div.innerhtml = div.innerhtml + 'item added'; } <div id='fixeddiv'> <table align="center" id="tradee"> <th rowspan="2"> other item</th> <?php while($rowi =$item->fetch_assoc()) {?> <tr> <td> <?php echo $rowi['item_name']; ?> </td> <td><?php echo $rowi['item_description'];?></td> </tr> <?php } ?> </table> <br> <table align="center" id="tradetable"
Read more

javascript - Mootools wait with Fx.Morph start -

i trying var effect = new fx.morph(testmorph, { wait/delay 2 seconds before starting. ( fiddle here ) but when try .wait(2000) or .delay(2000) , or .wait(2000, effect) uncaught typeerror: object [object object] has no method 'delay' any ideas how working? code i'm using: var testmorph = document.id('testmorph'); var effect = new fx.morph(testmorph, { transition: 'back:out', duration: 900, link: 'chain' }).start({ 'top': 20, 'opacity': 1 }).start({ 'border-color': '#a80025', 'color': '#a80025' }); effect.delay(2000); you can use combination of chain() , delay() achieve desired effect. new fx.morph(testmorph, { transition: 'back:out', duration: 900, link: 'chain' }).start().chain(function(){ this.start.delay(2000,effect,{ //first }); }).chain(function(){ this.start({ //second }); }); the
Read more

php - Navigate throught databse rows -

i run image hosting site, , ive run problem. want make 2 buttons beside pic "next image" , "prev image". im new php/mysql , haveing troubles. check out got. use id (numbers) find correct row, have image name build next link. how make below query next , prev image names + ids? $query_next = ("select imageid, image_name images image_name = '$image_main' order imageid desc limit 1"); $query_prev = ("select imageid, image_name images image_name = '$image_main' order imageid asc limit 1"); // next $next = mysql_query($query_next); // prev $prev = mysql_query($query_prev); while ($row = mysql_fetch_assoc($next)) { $next = $row['image_name']; } while ($row = mysql_fetch_assoc($prev)) { $prev = $row['image_name']; } the html = > simple stuff. <a href="http://mysite.com/view_image/<?=$next?>">next image</a> <a href="http://mysite.com/view_image/<?=$pr
Read more